Kongsbergia (s. str.) dentata Walter, 1947

Gerecke, Reinhard, 2014, Studies on European species of the water mite family Aturidae Thor (Acari: Hydrachnidia), Zootaxa 3841 (1), pp. 1-46 : 22-23

Kongsbergia (s. str.) dentata Walter, 1947

Fig. 16

Material examined. Type series: Holotype ♂, NHMB 4705 , " Kongsbergia dentata Typus ♂, Kaltbrunnental , Kiesbank , 24.10.1943, Walter XV/44"; paratypes, same data as holotype: NHMB 4706 ♀ "XV/45", NHMB 4706 dn "XV/46".

Germany: Harz, SMF 44617 (0/1/0), D 486 (1/0/0). France: Corsica, F 39 Int (0/2/0). Italy: Reggio Emilia, I 1375 (1/1/0); Sardinia, I 389 Int (0/1/0); Sicily, I 493 (1/1/0), I 514 Int (2/1/0), I 515 Int (0/0/1)?, I 550 Int (0/1/0), I 646 Int (0/1/1); Switzerland: Ticino, Rensburg coll. NHMB 4710 (0/1/0).

First records from Italy.

Remarks. This species is not confusable due to the characteristics of the palp (in both sexes slender, P-4 L/H ratio 3.7–4.3, P- 4 in males with a pointed projection, in females P-2 without ventral projections and P-4 ventral setae inserting distally). Furthermore, the male IV-L is characteristic (IV-L-4 distal setae pectinate, one of these very long; IV-L-5 proximal and central ventral setae near centre of segment, distoventral seta short, peg-like; IV-L- 6 with smooth ventral margin smooth). A small dent on the anterolateral margin of the Cx-I is name-giving.

Measurements of three males (NHMB 4705, 4709, SMF 52038) and three females (NHMB 4706, 4710, SMF 44617): Males: Idiosoma L/W 390–420/235–270 (ratio 1.4–1.8), dL 370–380; IV-L (L/H, L/H ratio): IV-L-4, 85–88/38–45, 1.9–2.3; IV-L-5, 80–85/40–46, 1.7–2.1; IV-L-6, 128–133/38–40, 3.2–3.5; L ratio IV-L-4/5, 1.0; IV- L-4/6, 0.7; IV-L-5/6, 0.6. Palp measurements (L/H, L/H ratio, relative L % total L): P-1, 23–25/18–23, 1.0–1.3, 8–9; P-2, 70–85/35–38, 1.9–2.3, 27–29; P-3, 25–30/24–28, 1.0–1.1, 10–11; P-4, 93–108/24–25, 3.7–4.3, 35–36; P- 5, 48–50/11–13, 4.0–4.2, 17–18. L ratio P-2/P-3, 2.6–3.0; P-2/P-4, 0.75–0.8; P-3/P-4, 0.27–0.30; P4/P-2+3, 0.9. Females: Idiosoma L/W 430–450/280–300 (ratio 1.4–1.6), dL 380–420; Palp measurements (L/H, L/H ratio, relative L % total L): P-1, 23–25/18–23, 1.0–1.3, 8–9; P-2, 70–85/35–38, 1.9–2.3, 27–29; P-3, 25–30/24–28, 1.0–1.1, 10–11; P-4, 93–108/24–25, 3.7–4.3, 35–36; P-5, 48–50/11–13, 4.0–4.2, 17–18. L ratio P-2/P-3, 2.6–3.0; P- 2/P-4, 0.75–0.8; P-3/P-4, 0.27–0.30; P4/P-2+3, 0.9.

Figures

FIGURE 16. Kongsbergia dentata. A. – C, male. A. IV-L- 4 – 6; B. palp; C. dorsum. D. – E. female; D. palp; E. venter. Scale bars = 100 µm.